Miniaturized temperature loggers placed in Red-necked Grebe (Podiceps grisegina) nests revealed that 16 of the 32 monitored pairs abandoned their nests for extended periods lasting 3-9 h during at least two of the three nights that they were monitored. When incubating pairs left their nests unattended, temperatures of the thermistored egg usually dropped precipitously to below 30°C within 15-25 min. Duration of a pair’s incubation period was positively associated with the number of minutes that the thermistored egg was below 30°C in our 3-day samples, yet nesting success remained high. Embryos appeared to be tolerant of this cooling; 26 of the 32 monitored nests hatched young, and there was no detectable increase in the failure of eggs to hatch for pairs neglecting their clutches more than 3 h per night. We suggest Red-necked Grebes preemptively leave their nests at night to avoid predation on their eggs or themselves.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 25 • No. 4